UnknownCurrencyException for custom currency

[zefcarried]

Hello,

I was hoping to use your package with the bavix/laravel-wallet package, but ran into an issue when trying to access a price with a custom currency name.

I was able to create prices using a custom currency without any issues, but when I tried to access $model->price I received the UnknownCurrencyException.

Is there any chance you could modify this package so it could work with custom currencies while keeping most of the functionality in-tact? Perhaps a config value could be used (which defaults to false) that, if set to true, does not attempt to lookup a valid currency code?

Thanks in advance!